![image](https://gist.github.com/assets/112948305/0852118c-39ea-49b9-90c5-78157fe70e40)


## Deploy Node js App with Mongo DB and Mongo Express Using AKS

Deploying a Node.js application with MongoDB and Mongo Express on Azure Kubernetes Service (AKS) involves several steps. Here's a detailed guide to help you through the process:

### Prerequisites

1. **Azure Subscription**: Ensure you have an active Azure subscription.
2. **Azure CLI**: Install the Azure CLI on your local machine.
3. **Kubectl**: Install kubectl for interacting with your AKS cluster.
4. **Docker**: Install Docker to build your application images.
5. **Helm**: Install Helm for managing Kubernetes applications.

### Steps to Deploy

#### 1. Set Up AKS

1. **Create Resource Group**:
    ```bash
    az group create --name myResourceGroup --location eastus
    ```

2. **Create AKS Cluster**:
    ```bash
    az aks create --resource-group myResourceGroup --name myAKSCluster --node-count 1 --enable-addons monitoring --generate-ssh-keys
    ```

3. **Get AKS Credentials**:
    ```bash
    az aks get-credentials --resource-group myResourceGroup --name myAKSCluster
    ```

#### 2. Create a Docker Image for Your Node.js Application

1. **Dockerfile**: Create a `Dockerfile` for your Node.js application.
    ```Dockerfile
    FROM node:14

    # Create app directory
    WORKDIR /usr/src/app

    # Install app dependencies
    COPY package*.json ./
    RUN npm install

    # Bundle app source
    COPY . .

    # Expose port and start application
    EXPOSE 3000
    CMD [ "node", "app.js" ]
    ```

2. **Build and Push Docker Image**:
    ```bash
    docker build -t myusername/myapp:v1 .
    docker push myusername/myapp:v1
    ```

#### 3. Set Up MongoDB and Mongo Express with Helm

1. **Add Bitnami Repository**:
    ```bash
    helm repo add bitnami https://charts.bitnami.com/bitnami
    helm repo update
    ```

2. **Install MongoDB**:
    ```bash
    helm install my-mongodb bitnami/mongodb
    ```

3. **Install Mongo Express**:
    ```bash
    helm install my-mongo-express bitnami/mongodb-express --set mongodb.host=my-mongodb-mongodb.default.svc.cluster.local
    ```

#### 4. Deploy Node.js Application to AKS

1. **Create a Deployment YAML File**: `deployment.yaml`
    ```yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: my-node-app
    spec:
      replicas: 2
      selector:
        matchLabels:
          app: my-node-app
      template:
        metadata:
          labels:
            app: my-node-app
        spec:
          containers:
          - name: my-node-app
            image: myusername/myapp:v1
            ports:
            - containerPort: 3000
            env:
            - name: MONGO_URI
              value: "mongodb://my-mongodb-mongodb.default.svc.cluster.local:27017/mydatabase"
    ```

2. **Create a Service YAML File**: `service.yaml`
    ```yaml
    apiVersion: v1
    kind: Service
    metadata:
      name: my-node-app-service
    spec:
      selector:
        app: my-node-app
      ports:
        - protocol: TCP
          port: 80
          targetPort: 3000
      type: LoadBalancer
    ```

3. **Apply Deployment and Service**:
    ```bash
    kubectl apply -f deployment.yaml
    kubectl apply -f service.yaml
    ```

#### 5. Access Your Application

1. **Get External IP**:
    ```bash
    kubectl get services my-node-app-service
    ```

2. **Access Mongo Express**:
    ```bash
    kubectl get services my-mongo-express
    ```

Use the external IP address obtained from the above commands to access your Node.js application and Mongo Express in the browser.

### Summary
- **AKS Setup**: Create and configure the AKS cluster.
- **Docker Image**: Build and push the Docker image for your Node.js application.
- **MongoDB & Mongo Express**: Deploy MongoDB and Mongo Express using Helm.
- **Deployment**: Deploy the Node.js application and expose it using a LoadBalancer service.

Following these steps, you will have your Node.js application running on AKS, connected to MongoDB, with Mongo Express available for database management.

### Credits: [H A R S H H A A](https://github.com/NotHarshhaa)